Impact of fluid deformation on mixing‐induced chemical reactions in heterogeneous flows
Impact of fluid deformation on mixing‐induced chemical reactions in heterogeneous flows
复制标题
流体变形对非均质流中混合引起的化学反应的影响
DOI：
--
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
M. Dentz
中科院分区：
文献类型：
--
作者：
T. Borgne;T. Ginn;M. Dentz
地球物理流中的快速化学反应受流体混合控制，流体混合扰动局部化学平衡，从而引发化学反应。流速的空间波动导致材料流体元件的变形，其形成运输的化学物质的支撑体积。我们开发了一种基于流体混合的层状表示的方法，该方法提供了流体变形、浓度梯度分布和快速可逆反应的放大反应速率之间的直接联系。有效反应速率的时间演化由流动拓扑结构和局部速度梯度分布决定。这导致反应效率的显著增加，其结果是比均匀流大几个数量级。这种方法允许平衡反应速率的时间演变的系统评价，并建立了反应效率和基本流场的空间特性之间的直接联系，如通过材料流体元件的变形量化的。
Fast chemical reactions in geophysical flows are controlled by fluid mixing, which perturbs local chemical equilibria and thus triggers chemical reactions. Spatial fluctuations in the flow velocity lead to deformation of material fluid elements, which form the support volumes of transported chemical species. We develop an approach based on a lamellar representation of fluid mixing that provides a direct link between fluid deformation, the distribution of concentration gradients, and the upscaled reaction rates for fast reversible reactions. The temporal evolution of effective reaction rates is determined by the flow topology and the distribution of local velocity gradients. This leads to a significant increase of the reaction efficiency, which turns out to be orders of magnitude larger than in homogeneous flow. This approach allows for the systematic evaluation of the temporal evolution of equilibrium reaction rates and establishes a direct link between the reaction efficiency and the spatial characteristics of the underlying flow field as quantified by the deformation of material fluid elements.
影响因子：
5.2
作者：
de Barros, Felipe P. J.;Dentz, Marco;Nowak, Wolfgang
通讯作者：
Nowak, Wolfgang